As pointed out by Richard Earnshaw in [1], bfd_elf32_arm_target_relocs now takes
15 parameters. This commit creates a new structure to contain all of them but
the bfd and bfd_link_info values and adapt the function to take that structure
as parameter instead. While doing so, the function is renamed to
bfd_elf32_arm_target_params to reflect that the settings affect more than just
relocation.